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Expert Insulation Contractors in Duluth, MN
RTECH Insulation has built its reputation on delivering high-quality insulation solutions for both residential and commercial clients. Our process begins with meticulous preparation, ensuring all windows, doors, and flooring are protected to prevent damage during installation. We specialize in spray foam insulation, using advanced materials like SWD products and Certainteed blown-in fiberglass to create energy-efficient spaces that reduce heating and cooling costs. Our team prioritizes post-installation inspections to guarantee every project meets our rigorous quality standards.

With experience serving diverse projectsfrom single-family homes to commercial buildingswe focus on minimizing air leakage, controlling moisture, and improving indoor air quality. Our commitment to cleanliness ensures spaces are left ready for subsequent construction phases, free of debris and residue. By combining cutting-edge technology with proven techniques, we help clients achieve long-term energy savings while maintaining structural integrity and comfort.
Services
Spray Foam Insulation Closed-Cell Foam Residential Insulation Commercial Insulation Energy Efficiency
Highlights and features
  • We use SWD-certified spray foam for superior energy savings.
  • Our closed-cell foam reduces air leakage by up to 50%.
  • Post-installation inspections ensure quality and client satisfaction.
  • We specialize in both residential and commercial applications.
  • Our process minimizes mold growth through moisture control.
Services
Spray Foam Insulation
Our spray foam insulation creates a seamless barrier against air leakage and moisture. Using closed-cell and open-cell materials, we enhance energy efficiency in residential and commercial buildings. This solution reduces heating and cooling costs while improving indoor air quality and structural durability.
Closed-Cell Foam
Closed-cell foam provides the highest R-value per inch, minimizing thermal bridging. Ideal for attics, basements, and commercial roofs, it acts as a vapor retarder and structural reinforcement. Clients benefit from long-term energy savings and reduced mold risk due to its moisture-resistant properties.
Residential Insulation
We insulate new and existing homes with spray foam tailored to climate conditions. Our solutions address attics, garages, and cold storage areas, lowering utility bills and enhancing comfort. The process includes thorough prep work and post-installation cleanup to ensure minimal disruption.
Commercial Insulation
Commercial applications include industrial buildings, cold storage facilities, and multi-unit housing. Our spray foam extends roof longevity, seals air gaps, and meets energy code requirements. Projects are completed with minimal downtime, ensuring businesses maintain operational efficiency.
Energy Efficiency
By reducing air infiltration by up to 50%, our insulation systems cut energy consumption. This lowers utility costs and carbon footprints for homeowners and businesses. We focus on high-yield materials that deliver measurable savings without compromising performance or safety.
Questions
What types of insulation do you offer?
We specialize in closed-cell and open-cell spray foam insulation for residential and commercial properties.
How does spray foam reduce energy costs?
It seals air leaks and provides high R-value, reducing heating and cooling needs by up to 50%.
Do you work on commercial buildings?
Yes, we insulate commercial structures including cold storage facilities, industrial buildings, and multi-unit housing.
Is your insulation mold-resistant?
Closed-cell foam prevents moisture infiltration, reducing mold growth potential in walls and ceilings.
What areas do you serve?
We operate in Duluth, MN, Brule, WI, and surrounding regions for residential and commercial projects.
Reviews (2)
Jim Washko
Jan 22, 2021 Report
My initial opinion on this company was very positive. The owners estimate seemed fair and detailed until it came to doing the actual work. The night before the job was supposed to start, the owner decided to just then tell me that I would not be able to be in the house at all during the foam insulation. I can understand this because of the fumes, but forgetting to tell me ahead of time is unacceptable. The day came to do the insulation and nobody showed up. I finally texted the owner and that is when they finally broke the news to me that they would need to reschedule because of broken equipment
Jonathan Manning
Sep 02, 2016 Report
I used R-Tek Insulation to insulate my attic and garage. They were extremely professional and diligent throughout the process. I would recommend them to anyone looking to get a professional job done the right way.